…got boored one day so i started with this;)
…so im lookimg forward to try
…a Little overpreassure doesnt hurt… …original compensators are at 700 dollars, this… 1,5 dollar;)…the Gas pump is a reliable one, but no overpreassure. …Yes it will look different but this is the system how it works;) Simple;)
I’ll be interested to see the evolution of this project!
…will keep you posted
I’ve seen these used as compensators before. Solder sucker. go figure?!
solder sucker? what is that? …aaa a sucker for soldering? never seen theese;)
…and what systems did you see them on… i thought i was the first with that one… while buying the syringe, i saw this" female claner" but felt that tooo much:))))
Piston style in an aluminum tube would be pretty easy as long as you can get the piston to stay sealed.
de-soldering bulb.
I saw them on an early ROV from Shark Marine. sharkmarine.com Probably 20 years ago?? Was used on their thrusters.
Also good for sucking the boogers out of a kid’s nose. 
Hahahaha …but i guess it worked since they used it so im on the right path;)
Aluminium, plastic doesnt mater bec the pressure is the same inside as outside …i wont make them to heavy… i really want them i som kind of plastic… and if you see the syringe… a o ring and a piston you are there… if you have 1 bar overpressure your ok;) …and if you get a leak,well you have the time to recover and all the electronics still work;) …think the water ingress detectors will still work in Tellus 22;)
I did it all so simple. I have used a rubber sleeve. In one end I have a lid with BR vent plug. In the other end is the hose connecting to the electronic enclosure. The sleeve makes the over-pressure at you inflate it with oil. The whole thing costed less than 50 bucks.
…how do you get overpreassure?
Its very simple. Hold i vertical when you fill it. It streches. The strain in the rubber create a force. I have 0.4 bar overpressure
Nice, 0.4 is good enough …but im not quite done about the spring comp… kind of got driven by the 600 dollar Kystdesign… ;))
Overpressure is easily increased to 0.5 bar or. Higher. I found 0.4 to sufficient as it puts quite some force on the endcaps, more than 100KgF on my 8"
My i ask, where did you buy? Hehehe please say Biltema;))…i like your design ;)…are your boyancy coated? my 1000m?;D is soon going to the cnc;)
Its biltema 
Love it what section?;DD
…No point in buildong somehting that works Tnx Øystein ;)(how deep have you been?
